Class UrlFetchApp

// The code below logs the HTML code of the Google home page.
const response = UrlFetchApp.fetch('http://www.google.com/');
Logger.log(response.getContentText());

// Make a GET request and log the returned content.
const response = UrlFetchApp.fetch('http://www.google.com/');
Logger.log(response.getContentText());

// Make a POST request with form data.
const resumeBlob = Utilities.newBlob('Hire me!', 'text/plain', 'resume.txt');
const formData = {
  name: 'Bob Smith',
  email: 'bob@example.com',
  resume: resumeBlob,
};
// Because payload is a JavaScript object, it is interpreted as
// as form data. (No need to specify contentType; it automatically
// defaults to either 'application/x-www-form-urlencoded'
// or 'multipart/form-data')
const options = {
  method: 'post',
  payload: formData,
};
UrlFetchApp.fetch('https://httpbin.org/post', options);

// Make a POST request with a JSON payload.
const data = {
  name: 'Bob Smith',
  age: 35,
  pets: ['fido', 'fluffy'],
};
const options = {
  method: 'post',
  contentType: 'application/json',
  // Convert the JavaScript object to a JSON string.
  payload: JSON.stringify(data),
};
UrlFetchApp.fetch('https://httpbin.org/post', options);

// Make both a POST request with form data, and a GET request.
const resumeBlob = Utilities.newBlob('Hire me!', 'text/plain', 'resume.txt');
const formData = {
  name: 'Bob Smith',
  email: 'bob@example.com',
  resume: resumeBlob,
};
// Because payload is a JavaScript object, it is interpreted as
// as form data. (No need to specify contentType; it defaults to either
// 'application/x-www-form-urlencoded' or 'multipart/form-data')
const request1 = {
  url: 'https://httpbin.org/post',
  method: 'post',
  payload: formData,
};
// A request may also just be a URL.
const request2 = 'https://httpbin.org/get?key=value';
UrlFetchApp.fetchAll([request1, request2]);

// The code below logs the value for every key of the returned map.
const response = UrlFetchApp.getRequest('http://www.google.com/');
for (const i in response) {
  Logger.log(`${i}: ${response[i]}`);
}